In the many microwave applications the directional couplers are highly useful for the good coupling. Here the model of the directional coupler is being presented to provide the better characteristics. The proposed structure has I–shaped defects in the ground which provide the coupling of 20.6db which is near to 20db (required) at the frequency of 1.7GHz.The return loss and the directivity are also one of the effective measures for the coupler which also... Topics: Directional Coupler, Directivity, Return Loss
The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions. Topics: Directional hearing, Space perception, Optical illusions
TAH Non Directional Beacon What is an NDB? An NDB or Non-Directional Beacon is a ground-based, low frequency radio transmitter used as an instrument approach for airports and offshore platforms. The NDB transmits an omni-directional signal that is received by the ADF or Automatic Direction Finder, a standard instrument onboard aircraft. The pilot uses the ADF to determine the direction to the NDB relative to the aircraft. To navigate using the ADF, the pilot enters the frequency of... Topics: NDB, Non Directional Beacons, Carlo Giordani
Rob Carr Pty Ltd has completed a number of sewerage, drainage, water, storm water and gas projects for a variety of government authorities and private industry. Rob Carr Pty Ltd; 74-76 Union Circuit, Yatala, QLD 4207; Phone: 1300 883 602, Website: www.robcarr.com.au Topics: deep shaft excavation, tunnel construction company, directional drilling
This paper describes modeling of bi-directional grid-connected inverter for micro-grid applications at steady state and also studies the transient responses for various loading conditions. In this paper mainly the power conditioning unit for micro grid which consists of DC to AC grid connected inverter has been developed. In Inverter simulat ion model, a 50KW source is connected to the load as well as utility grid. In this simulation model, the power response of load and utility grid is... Topics: Micro Grid, Power Conditioning Unit, Bi- Directional Grid Connected Inverter
The seismic design of bridge structure is influenced by the bi-directional excitation phenomenon. The bidirectional effects have been ignored in most of the past studies. The calculation of maximum isolator displacements (as per the equation prescribed by AASHTO) also ignores the bidirectional effects of ground motion. In the formulation, the coupled behaviour of the isolation systems has also been ignored. However, these effects can play significant role in the seismic response of the bridge.... Topics: seismic, bridge, bi-directional, isolator, pushover, time history
Image segmentation is an important step in image processing and analysis, pattern recognition, and machine vision. A few of algorithms based on level set have been proposed for image segmentation in the last twenty years. However, these methods are time consuming, and sometime fail to extract the correct regions especially for noisy images. Recently, neutrosophic set (NS) theory has been applied to image processing for noisy images with indeterminant information. In this paper, a novel image... Topics: Image segmentation, Neutrosophic set, Directional alpha-mean filter, Level set
R&D Report 1956-22 : Power measurement in the frequency range 30-1000 Mc/s. G.H. Millard, R.H. Minns, G.D. Monteath Laboratory equipment has been developed for measuring power over a wide range of levels in the frequency range 30-1000 Mc/s. A milliwatt meter using thermistors measures powers between 1 and 20 mW directly, and its use is extended to higher powers by means of dissipative attenuators and directional couplers. Each item of the equipment is fitted with connectors, suitable for... Topics: power, directional, impedance, thermistors, measurement, attenuators, coupler, thermistor, voltage,...